Metallic packing for pistons



Oct. 7, 1924. 1,510,816

4 R. ALLEN METALLIC PACKING FOR PISTONS Filed April '7, 1923 3Sheets-Sheet l 'cile/g Oct. 7', 19M. 1,510,816

R. ALLENv METALLIC PACKING FOR PISTONS Filed April '7, 192.3 I 3Sheets-Sheet 2 3 g J //I/// METALLIC PACKING' FOR .PISTONS Filed. April7.-,1923 3 Sheets-Sheet 55 Patented Get 7, 1924,

UNITED STATES PATENr'oFFIcE."

ROBERT ALLEN, 0F OXON, ENGLAND.

'if f l j METALLIC PACKING Fon, Prs'roNs. L liij Application med April7, 1923. seriai No. 630,572. f

T 0 all whom t may concern.'

Be it known that I, ROBERT ALLEN, of Chiltern Rise, Woodcote, Oxon,England (whose post-oiice address is Chiltern Rise, I/Voodcote, Oxon,England), a subj ect of the King of Great Britain and Ireland, ha-veinvented certain new and useful Improvements in Metallic Packings forPistons, of which the following is a speciiica-tion.

This invention relates to metallic packing for pistons and the like, andis applica-- ble to the pistons of internal combustion engines, steamengines, compressors and in general to all pistons where it is desiredto provide an effective seal between the piston and its surroundingcylinder Wall.

According to this invention, each packing unit comprises a pair of splitrings arranged side by side in the same groove with their joints orsplits diametrically opposed, and joint or split closing or choke piecesadapted to prevent leakage of pressure fluid through the splits in therings, said choke pieces being pressed outwards radially by springs andeach engaging the split part of one ring and the neutral part of theother ring, that is to say, the part diametrically opposite the split orjoint of the ring. Each choke piece is also formed or provided in knownmanner with a projection or stop for engaging in the split portion orgap of the ring, and preventing the ring from turning in its groove.

In the accompanying three sheets of illustrative drawings:

Figs. 1 and 2 are a longitudinal and transverse section respectively ofa piston with packing constructed according to this invention,

Figs. 3 and 4 are similar views to Figs. 1 and 2. showing a slightlymodiiied form of construction and Figs. 5 and 6 are elevations at rightangles of one of the split packing rings,

Fig. 7 illustrates in end, side and sectional detail views a socketprovided in some cases for holding the split-closing piece or choke andits spring,

Figs. 8 and 9 are detail views of splitclosing pieces or chokes.

choke pieces are not in alignment, Abeing preferably arranged so thatthe part of the pocket or recess from which a joint or split closingsegment f of the choke projects, is cut entirely in the side wall of thegroove. Each choke piece d, d is recessed at its outer end to a depthcorresponding with the groove in the piston and under the iniuence ofits spring g presses outwardly on both packing rings, the said chokebeing located opposite the split portion of one ring which is closedthereby and opposite that part of the other ring which is diametricallyopposite its split, the result being that both rings are pressedoutwards by the two plungers or choke pieces both at their joints orsplit portions, and at their opposite or neutral points, and by thismeans closecontact between the rings and cylinder wall at all parts ofthe periphery is ensured.

A stop 7L is either formed on the choke plunger as clearly shown in Fig.8 or may be attached in the form of a stud as shown in Fig. 9. The stopz, is intended by engaging an enlargement i of the split (Fig. 5) toprevent the split ring from turning in its groove.

In some cases as shown in Figs. 3 and4 and Fig. 7, socket pieces j forthe reception of the chokes d, d may be secured in radial' holes boredin the piston body, the walls of the sockets being enlarged at theiropen or outer ends to form shoulders y" which rest against shouldersformed by counter-boring the radial holes. The enlarged outer ends ofthe socket pieces are also grooved or recessed as at 7c, to accommodatethe packing rings.

I claim The combination with a piston or the like having a packinggroove and recesses opening into said groove at diametrically o positepoints, of a pair of split packing rings arranged in said groove, sideby side, and tion disposed between and pressing against with theirjoints diametrically opposite and the ends of the other ring, wherebyboth disposed over said recesses, spring-pressed rings are maintainedexpanded but are 10 plungers mounted in said recesses, each of lockedagainst rotation in said groove.

5 said lungers being provided with a portion In testimony whereof he hasaiiixed his pressing against the intermediate portion of signature.

one ring. and with another projecting por-l ROBERT ALLEN`

